所有,迭代器,但仍ConcurrentModificationException的
运行到ConcurrentModificationException的问题,并努力寻找解决部分是因为我不能看到我modifiying列表而迭代它...任何想法?我突出显示了导致问题的一行(it3.remove())。真正在这一个停顿..
编辑:堆栈跟踪:
Exception in thread "Thread-4" java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
at java.util.ArrayList$Itr.next(Unknown Source)
at com.shimmerresearch.advancepc.InternalFrameAndPlotManager.subtractMaps(InternalFrameAndPlotManager.java:1621)
线1621对应于it3.remove()在我上面提到的代码。
private void subtractMaps(ConcurrentSkipListMap<String, PlotDeviceDetails> firstMap, ConcurrentSkipListMap<String, PlotDeviceDetails> secondMap) {
// iterate through the secondmap
Iterator<Entry<String, PlotDeviceDetails>> it1 = secondMap.entrySet().iterator();
while (it1.hasNext()) {
Entry<String, PlotDeviceDetails> itEntry = (Entry) it1.next();
String mapKey = (String) it1Entry.getKey();
PlotDeviceDetails plotDeviceDetails = (PlotDeviceDetails)it1Entry.getValue();
// if we find an entry that exists in the second map and not in the first map continue
if(!firstMap.containsKey(mapKey)){
continue;
}
// iterate through a list of channels belonging to the secondmap
Iterator <PlotChannelDetails> it2 = plotDeviceDetails.mListOfPlotChannelDetails.iterator();
while (it2.hasNext()) {
PlotChannelDetails it2Entry = it2.next();
// iterate through a list of channels belonging to the firstmap
Iterator <PlotChannelDetails> it3 = firstMap.get(mapKey).mListOfPlotChannelDetails.iterator();
innerloop:
while(it3.hasNext()){
// if a channel is common to both first map and second map, remove it from firstmap
PlotChannelDetails it3Entry = it3.next();
if(it3Entry.mChannelDetails.mObjectClusterName.equals(it2Entry.mChannelDetails.mObjectClusterName)){
it3.remove(); // this line is causing a concurrentModificationException
break innerloop;
}
}
}
}
}
请将完整的堆栈跟踪添加到您的问题。堆栈跟踪还包含发生问题的确切行号,所以它可以帮助您突出显示它,而不用猜测。 – RealSkeptic
首先使用适当的泛型让您的代码更易于阅读。 – chrylis
@RealSkeptic堆栈跟踪在编辑中添加..它确认引发异常的行是it3.remove() – Strokes